SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719876178e2111018807a7f363e832c05f22ee50cb244c0dd1b89bdd60047c85' 
  AND token = 'K9P9ztNUoTs2y1rFA/nLyWkXFmC0GhuLxQQoLbunn6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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