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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 (
    5120, 5121, 5122, 5123, 5124, 5125, 5126, 
    5127, 5128, 5129, 5130, 340, 341, 342, 
    343, 344, 345, 346, 412, 413, 414, 1366, 
    1367, 1368, 1369, 1370, 1371, 1372, 
    1373, 1374, 1375, 1376, 1377, 1378, 
    1379, 1380, 1381, 1382, 1383, 1384, 
    1385, 1386, 1387, 1388, 1389, 1390, 
    1391, 1392
  ) 
  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 0.00042

JSON explain

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