SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb19ba9d8cbed404e94480a31ae86631eb58cee934cb06ad2d3d2388432ae7d' 
  AND token = '6XW2Td2bC0S90tgv3MJsd6RIlKSts2lj0nn3aq/GA+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

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