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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 (
    325, 326, 327, 328, 329, 330, 415, 416, 
    417, 418, 3616, 3617, 3618, 4080, 4081, 
    4082, 4083, 4084, 4085, 4086, 4156, 
    4157, 4158, 4159, 4160, 4161, 4162, 
    4209, 4210, 4211, 4212, 4213, 4214, 
    4215, 3102, 3110, 6670, 6685, 6698, 
    3095, 3101, 3108, 6683, 6697, 3099, 
    19, 20, 21
  ) 
  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 0.00041

JSON explain

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