SELECT 
  id, 
  restart_time 
FROM 
  cscart_auction 
WHERE 
  no_winner = 'R'

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.04"
    },
    "table": {
      "table_name": "cscart_auction",
      "access_type": "ALL",
      "rows_examined_per_scan": 5,
      "rows_produced_per_join": 1,
      "filtered": "20.00",
      "cost_info": {
        "read_cost": "0.95",
        "eval_cost": "0.10",
        "prefix_cost": "1.05",
        "data_read_per_join": "656"
      },
      "used_columns": [
        "id",
        "no_winner",
        "restart_time"
      ],
      "attached_condition": "(`dev_yourmart_co_bw`.`cscart_auction`.`no_winner` = 'R')"
    }
  }
}