SELECT 
  id 
FROM 
  cscart_sg_auction 
WHERE 
  `product_id` = 391030 
  AND `status` = 'A' 
  AND `winner_user_id` = 0 
  AND `buy` = 'no' 
  AND `auto_win` = 1 
  AND last_price > 0

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.0203088,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_sg_auction",
          "access_type": "ALL",
          "loops": 1,
          "rows": 58,
          "cost": 0.0203088,
          "filtered": 100,
          "attached_condition": "cscart_sg_auction.product_id = 391030 and cscart_sg_auction.winner_user_id = 0 and cscart_sg_auction.auto_win = 1 and cscart_sg_auction.`status` = 'A' and cscart_sg_auction.buy = 'no' and cscart_sg_auction.last_price > 0"
        }
      }
    ]
  }
}