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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 (
    4050, 4051, 4128, 4129, 4130, 4131, 4132, 
    4133, 4134, 4181, 4182, 4183, 4184, 
    4185, 4186, 4187, 26, 27, 28, 72, 73, 
    74, 75, 133, 134, 135, 136, 137, 138, 
    139, 240, 241, 242, 293, 294, 295, 296, 
    3520, 3521, 3522, 3523, 3524, 3936, 
    3937, 3938, 3983, 3984, 4042
  ) 
  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 0.00026

JSON explain

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