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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 (
    1504, 1494, 6209, 1499, 1489, 1433, 6614, 
    2268, 2269, 2270, 2271, 2336, 2337, 
    2338, 2339, 2412, 2413, 2414, 2415, 
    2416, 2417, 2418, 2419, 2420, 2514, 
    2515, 2516, 2517, 2518, 2604, 2605, 
    2606, 2607, 3840, 3841, 3842, 3843, 
    5867, 5868, 5869, 5870, 5871, 5935, 
    5936, 5937, 5938, 5939, 6012
  ) 
  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 0.00027

JSON explain

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