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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 (
    6688, 6689, 6694, 6702, 6706, 6708, 6726, 
    6725, 3103, 3097, 3113, 6687, 6699, 
    36, 37, 38, 39, 40, 41, 42, 83, 84, 85, 
    86, 87, 88, 89, 147, 148, 149, 150, 151, 
    152, 153, 168, 169, 170, 171, 172, 173, 
    174, 250, 251, 252, 253, 254, 255, 256
  ) 
  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 0.00038

JSON explain

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