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 (
    89591, 89586, 89585, 89584, 89583, 89121, 
    89120, 89119, 89118, 89117, 89116, 
    89089, 89088, 89087, 89695, 89549, 
    89548, 89547, 89482, 89283, 89097, 
    89096, 89095, 89094, 89093, 89091, 
    89050, 89049, 89048, 89508, 89507, 
    89506, 89505, 89504, 89025, 89024, 
    89023, 89022, 89021, 89020
  ) 
  AND cscart_product_prices.lower_limit = 1 
  AND cscart_product_prices.usergroup_id IN (0, 1) 
GROUP BY 
  cscart_product_prices.product_id