SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53b50cfce4d9f69eb5dc148582ec4d7328bb4a602147343bb98ff7482a6bb85b' 
  AND token = 'JR3lBC8REK87JftquwpdaeXlbb+NEKYmW6cV/JQoMBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

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