MySQL server has gone away
SELECT pot.*, pot.name_ru AS _name_sort, povt.* FROM SC_product_options_values as povt LEFT JOIN SC_product_options as pot ON pot.optionID=povt.optionID WHERE povt.productID IN ('21420','21425','21424','21426','21419','21423','21422','21421') ORDER BY pot.sort_order, _name_sort