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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 (
    6418, 6419, 6420, 6421, 2823, 2824, 2825, 
    2826, 6408, 6409, 6410, 6411, 6412, 
    2827, 2828, 2829, 2830, 2831, 6413, 
    6414, 6415, 6416, 2928, 2929, 2930, 
    2931, 2932, 6513, 6514, 6515, 6516, 
    3032, 6609, 3028, 3029, 3030, 3031, 
    6605, 6606, 6607, 6608, 6610, 6611, 
    6612, 6613, 3024, 3025, 3026, 3027, 
    3301, 6847, 3300, 2841, 2842, 2843, 
    2844, 6426, 6427, 6428, 6429, 6430, 
    2765, 2766, 2767, 2768, 6352, 6353, 
    6354, 6355, 6356, 2185, 2186, 2187, 
    2188, 5785, 5786, 5787, 5788, 5789, 
    6641, 6219, 5807, 3722, 5819, 1516, 
    6623, 1504, 1494, 6209, 1499, 1489, 
    1433, 6614, 2268, 2269, 2270
  ) 
  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 0.00030

JSON explain

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