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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f98e52b7b37b64c9d05ae1ea9be68812e9d29c1067bc99f2996c0a669f616d2' 
  AND token = 'Cj/l5k/UFZvGiscU5/JISBKopP9NNXBIkrw5H42CSsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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