SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7580ce2af5fb2bd1acf964125653d711134220b1cbf9d3d029972624355062' 
  AND token = 'UHpN7IARKyGYFbhucq1iFVbC+M0W0zNmK+X4MWXv/Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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