Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ecb02c5ea79a82df924fbe85cd944b2e9944ed141d1ff71148ba64a58bc9c2' 
  AND token = 'kN2zxP7lEYit4gsXe5eKdha01EB39lMLfFokWR1PbNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

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