SELECT 
  cscart_product_prices.product_id, 
  MIN(
    IF(
      cscart_product_prices.percentage_discount = 0, 
      cscart_product_prices.price, 
      cscart_product_prices.price - (
        cscart_product_prices.price * cscart_product_prices.percentage_discount
      )/ 100
    )
  ) AS price 
FROM 
  cscart_product_prices 
WHERE 
  cscart_product_prices.product_id IN (
    45239, 45238, 45237, 45236, 45235, 45234, 
    45233, 45232, 45231, 45230, 45229, 
    45228, 45227, 45226, 45225, 45224, 
    45223, 45222, 45221, 45220, 45219, 
    45218, 45217, 45216, 45215
  ) 
  AND cscart_product_prices.lower_limit = 1 
  AND cscart_product_prices.usergroup_id IN (0, 1) 
GROUP BY 
  cscart_product_prices.product_id