SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c45294b853c9db0deb9cf35f10d846e8efc748ff14d893899937464cef196d69' 
  AND token = 'yn0WbbDCDGgxqSdnPC9XaySDRRKa5Tt3/JAS0FLEwUs=' 
  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