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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 (
    3821, 3822, 3823, 3824, 3825, 3826, 3827, 
    3828, 3829, 3830, 3831, 3832, 3778, 
    2103, 2104, 2105, 2106, 2107, 2108, 
    2109, 2110, 2111, 2112, 2113, 2114, 
    2115, 2116, 2117, 2118, 2119, 2120, 
    2121, 2122, 2123, 2124, 2125, 2126, 
    2127, 2128, 2129, 3752, 3753, 3754, 
    3755, 3756, 3757, 3758, 3759
  ) 
  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 0.00032

JSON explain

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