SELECT 
  SQL_CALC_FOUND_ROWS products.product_id, 
  descr1.product as product, 
  companies.company as company_name, 
  products.product_type, 
  products.parent_product_id, 
  IF(
    products.age_verification = 'Y', 
    'Y', 
    IF(
      cscart_categories.age_verification = 'Y', 
      'Y', cscart_categories.parent_age_verification
    )
  ) as need_age_verification, 
  IF(
    products.age_limit > cscart_categories.age_limit, 
    IF(
      products.age_limit > cscart_categories.parent_age_limit, 
      products.age_limit, cscart_categories.parent_age_limit
    ), 
    IF(
      cscart_categories.age_limit > cscart_categories.parent_age_limit, 
      cscart_categories.age_limit, cscart_categories.parent_age_limit
    )
  ) as age_limit, 
  (
    opt_prices.product_id IS NOT NULL 
    AND abt_normal_prices.price > 0
  ) AS ab__is_qty_discount, 
  sop.old_product_only 
FROM 
  cscart_products as products 
  LEFT JOIN cscart_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'en' 
  LEFT JOIN cscart_product_prices as prices ON prices.product_id = products.product_id 
  AND prices.lower_limit = 1 
  LEFT JOIN cscart_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN cscart_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = products_categories.category_id 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND cscart_categories.status IN ('A', 'H') 
  AND cscart_categories.storefront_id IN (0, 1) 
  LEFT JOIN cscart_warehouses_sum_products_amount as war_sum_amount ON war_sum_amount.product_id = products.product_id 
  LEFT JOIN cscart_product_prices AS opt_prices ON opt_prices.product_id = products.product_id 
  AND opt_prices.lower_limit > 1 
  AND opt_prices.usergroup_id IN (0, 1) 
  LEFT JOIN cscart_product_prices AS abt_normal_prices ON abt_normal_prices.product_id = products.product_id 
  AND abt_normal_prices.lower_limit = 1 
  LEFT JOIN cscart_sg_old_product_sell as sop ON sop.product_id = products.product_id 
WHERE 
  1 
  AND cscart_categories.category_id IN (269, 326, 439, 397) 
  AND companies.status IN ('A') 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND prices.usergroup_id IN (0, 0, 1) 
  AND products.parent_product_id = 0 
  AND products.product_type != 'D' 
  AND (
    sop.old_product_only = "Y" 
    OR sop.old_product_only IS NULL
  ) 
GROUP BY 
  products.product_id 
ORDER BY 
  product asc, 
  products.product_id ASC 
LIMIT 
  0, 48

Query time 0.00239

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "15.49"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "nested_loop": [
          {
            "table": {
              "table_name": "cscart_categories",
              "access_type": "range",
              "possible_keys": [
                "PRIMARY",
                "c_status",
                "p_category_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id"
              ],
              "key_length": "3",
              "rows_examined_per_scan": 4,
              "rows_produced_per_join": 0,
              "filtered": "4.00",
              "index_condition": "(`dev_yourmart_co_bw`.`cscart_categories`.`category_id` in (269,326,439,397))",
              "cost_info": {
                "read_cost": "2.79",
                "eval_cost": "0.02",
                "prefix_cost": "2.81",
                "data_read_per_join": "433"
              },
              "used_columns": [
                "category_id",
                "usergroup_ids",
                "status",
                "age_verification",
                "age_limit",
                "parent_age_verification",
                "parent_age_limit",
                "storefront_id"
              ],
              "attached_condition": "(((`dev_yourmart_co_bw`.`cscart_categories`.`usergroup_ids` = '') or (0 <> find_in_set(0,`dev_yourmart_co_bw`.`cscart_categories`.`usergroup_ids`)) or (0 <> find_in_set(1,`dev_yourmart_co_bw`.`cscart_categories`.`usergroup_ids`))) and (`dev_yourmart_co_bw`.`cscart_categories`.`status` in ('A','H')) and (`dev_yourmart_co_bw`.`cscart_categories`.`storefront_id` in (0,1)))"
            }
          },
          {
            "table": {
              "table_name": "products_categories",
              "access_type": "ref",
              "possible_keys": [
                "PRIMARY",
                "pt"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "category_id"
              ],
              "key_length": "3",
              "ref": [
                "dev_yourmart_co_bw.cscart_categories.category_id"
              ],
              "rows_examined_per_scan": 89,
              "rows_produced_per_join": 14,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.13",
                "eval_cost": "1.42",
                "prefix_cost": "4.36",
                "data_read_per_join": "227"
              },
              "used_columns": [
                "product_id",
                "category_id"
              ]
            }
          },
          {
            "table": {
              "table_name": "products",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "status",
                "idx_parent_product_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "dev_yourmart_co_bw.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 3,
              "filtered": "23.23",
              "cost_info": {
                "read_cost": "3.56",
                "eval_cost": "0.33",
                "prefix_cost": "9.35",
                "data_read_per_join": "17K"
              },
              "used_columns": [
                "product_id",
                "product_type",
                "status",
                "company_id",
                "usergroup_ids",
                "age_verification",
                "age_limit",
                "parent_product_id"
              ],
              "attached_condition": "((`dev_yourmart_co_bw`.`products`.`parent_product_id` = 0) and ((`dev_yourmart_co_bw`.`products`.`usergroup_ids` = '') or (0 <> find_in_set(0,`dev_yourmart_co_bw`.`products`.`usergroup_ids`)) or (0 <> find_in_set(1,`dev_yourmart_co_bw`.`products`.`usergroup_ids`))) and (`dev_yourmart_co_bw`.`products`.`status` = 'A') and (`dev_yourmart_co_bw`.`products`.`product_type` <> 'D'))"
            }
          },
          {
            "table": {
              "table_name": "companies",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "company_id"
              ],
              "key_length": "4",
              "ref": [
                "dev_yourmart_co_bw.products.company_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "10.00",
              "cost_info": {
                "read_cost": "0.83",
                "eval_cost": "0.03",
                "prefix_cost": "10.50",
                "data_read_per_join": "2K"
              },
              "used_columns": [
                "company_id",
                "status",
                "company"
              ],
              "attached_condition": "(`dev_yourmart_co_bw`.`companies`.`status` = 'A')"
            }
          },
          {
            "table": {
              "table_name": "prices",
              "access_type": "ref",
              "possible_keys": [
                "usergroup",
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "key": "product_id",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "dev_yourmart_co_bw.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "59.08",
              "cost_info": {
                "read_cost": "0.08",
                "eval_cost": "0.02",
                "prefix_cost": "10.62",
                "data_read_per_join": "4"
              },
              "used_columns": [
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "attached_condition": "((`dev_yourmart_co_bw`.`prices`.`lower_limit` = 1) and (`dev_yourmart_co_bw`.`prices`.`usergroup_id` in (0,0,1)))"
            }
          },
          {
            "table": {
              "table_name": "descr1",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "product_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id",
                "lang_code"
              ],
              "key_length": "9",
              "ref": [
                "dev_yourmart_co_bw.products_categories.product_id",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.05",
                "eval_cost": "0.02",
                "prefix_cost": "10.69",
                "data_read_per_join": "763"
              },
              "used_columns": [
                "product_id",
                "lang_code",
                "product"
              ]
            }
          },
          {
            "table": {
              "table_name": "war_sum_amount",
              "access_type": "ref",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "dev_yourmart_co_bw.products_categories.product_id"
              ],
              "rows_examined_per_scan": 20,
              "rows_produced_per_join": 3,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.07",
                "eval_cost": "0.39",
                "prefix_cost": "11.15",
                "data_read_per_join": "62"
              },
              "used_columns": [
                "product_id"
              ]
            }
          },
          {
            "table": {
              "table_name": "opt_prices",
              "access_type": "ref",
              "possible_keys": [
                "usergroup",
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "key": "product_id",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "dev_yourmart_co_bw.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 3,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.98",
                "eval_cost": "0.39",
                "prefix_cost": "12.52",
                "data_read_per_join": "93"
              },
              "used_columns": [
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "attached_condition": "<if>(is_not_null_compl(opt_prices), ((`dev_yourmart_co_bw`.`opt_prices`.`lower_limit` > 1) and (`dev_yourmart_co_bw`.`opt_prices`.`usergroup_id` in (0,1))), true)"
            }
          },
          {
            "table": {
              "table_name": "abt_normal_prices",
              "access_type": "ref",
              "possible_keys": [
                "usergroup",
                "product_id",
                "lower_limit"
              ],
              "key": "product_id",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "dev_yourmart_co_bw.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 3,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.98",
                "eval_cost": "0.39",
                "prefix_cost": "13.89",
                "data_read_per_join": "93"
              },
              "used_columns": [
                "product_id",
                "price",
                "lower_limit"
              ],
              "attached_condition": "<if>(is_not_null_compl(abt_normal_prices), (`dev_yourmart_co_bw`.`abt_normal_prices`.`lower_limit` = 1), true)"
            }
          },
          {
            "table": {
              "table_name": "sop",
              "access_type": "ALL",
              "rows_examined_per_scan": 8,
              "rows_produced_per_join": 7,
              "filtered": "23.44",
              "using_join_buffer": "hash join",
              "cost_info": {
                "read_cost": "0.87",
                "eval_cost": "0.73",
                "prefix_cost": "15.49",
                "data_read_per_join": "5K"
              },
              "used_columns": [
                "user_id",
                "product_id",
                "old_product_only"
              ],
              "attached_condition": "(<if>(found_match(sop), ((`dev_yourmart_co_bw`.`sop`.`old_product_only` = 'Y') or (`dev_yourmart_co_bw`.`sop`.`old_product_only` is null)), true) and <if>(is_not_null_compl(sop), (`dev_yourmart_co_bw`.`sop`.`product_id` = `dev_yourmart_co_bw`.`products_categories`.`product_id`), true))"
            }
          }
        ]
      }
    }
  }
}