SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '588029654ca1f93a70849a1cdd9987319044776b92efbfcd78fe06a553ec1e6c' 
  AND token = 'm6QynBAKTKw+823dPGQbYs2M/osOBoIwpU9Y9zBNJJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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