UPDATE 
  cscart_ec_em_viewed_products 
SET 
  `product_ids` = '172,128,238,248,34,282,278,167,78,11,12,1,23,280,5,170,150,177,8,56,217,106,48,49,73,52,244,70,205,243,221,132,55,60,218,65,86,63,39,105,210,36,67,29,214,142,90,33,32,59,76,58,64,62,130,232,247,171,79,168,117,156,211,91,18,120,35,161,201,16,174,231,104,20', 
  `user_id` = 0, 
  `timestamp` = 1779288292 
WHERE 
  user_id = 0