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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 (
    2734, 6318, 6319, 6320, 6321, 2726, 2727, 
    2728, 2729, 6313, 6314, 6315, 6316, 
    6317, 1573, 1574, 1575, 1576, 1577, 
    1578, 1579, 1580, 1581, 1582, 1583, 
    1584, 1585, 1586, 1587, 1588, 1589, 
    1590, 1591, 1592, 1593, 1594, 1595, 
    1596, 1597, 1598, 5272, 5273, 5274, 
    5275, 5276, 5277, 5278, 5279
  ) 
  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 0.00033

JSON explain

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