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SELECT 
  cscart_ult_product_prices.product_id, 
  MIN(
    IF(
      cscart_ult_product_prices.percentage_discount = 0, 
      cscart_ult_product_prices.price, 
      cscart_ult_product_prices.price - (
        cscart_ult_product_prices.price * cscart_ult_product_prices.percentage_discount
      )/ 100
    )
  ) AS price 
FROM 
  cscart_ult_product_prices 
WHERE 
  cscart_ult_product_prices.product_id IN (
    6303, 6304, 6305, 6306, 1500, 1501, 1502, 
    1503, 3726, 5206, 5207, 5208, 5209, 
    6736, 1490, 1491, 1492, 1493, 3724, 
    5198, 5199, 5200, 5201, 6735, 1495, 
    1496, 1497, 1498, 3164, 3725, 5202, 
    5203, 5204, 5205, 1485, 1486, 1487, 
    1488, 3163, 3723, 5194, 5195, 5196, 
    5197, 1429, 1430, 1431, 1432
  ) 
  AND cscart_ult_product_prices.lower_limit = 1 
  AND cscart_ult_product_prices.company_id = 1 
  AND cscart_ult_product_prices.usergroup_id IN (0, 0, 1) 
GROUP BY 
  cscart_ult_product_prices.product_id

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}