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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa673c916c76cba4c6a4a7711b5879970bbbfd18c9d818662650f21efd1f522' 
  AND token = 'AMplUR9x3Zz9hKkUeEdCzv0S6C9CCxWycVZgRscgKCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

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