SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc363bfcdac76e511acd38744ef32d565f28b22ef2abbfc3496520c54b657465' 
  AND token = 'QlzKPnEt+rUKNBcxXdWasyPO6BIMmKxfPSUIxMztFxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables