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 (
    59836, 59835, 59834, 59833, 59832, 59831, 
    59830, 59829, 59828, 59827, 59826, 
    59825, 59824, 59823, 59822, 59821, 
    59820, 59819, 59818, 59817, 59816, 
    59815, 59814, 59813, 59812, 59811, 
    59810, 59809
  ) 
  AND cscart_product_prices.lower_limit = 1 
  AND cscart_product_prices.usergroup_id IN (0, 1) 
GROUP BY 
  cscart_product_prices.product_id