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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 (
    294, 295, 296, 3520, 3521, 3522, 3523, 
    3524, 3936, 3937, 3938, 3983, 3984, 
    4042, 4043, 4044, 4124, 4125, 4126, 
    4127, 4178, 4179, 4180, 43, 44, 45, 46, 
    47, 48, 49, 90, 91, 92, 93, 94, 95, 96, 
    154, 155, 156, 157, 158, 159, 160, 175, 
    176, 177, 178
  ) 
  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 0.00029

JSON explain

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