Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c0658259838df5f9e732473c627633cff51b10be10887b757e1614a561c6dc' 
  AND token = 'VBB6UwnG1wDpMq3zY027j23GaNTNEuqwgok10okFqwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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