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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b47d6d89517e7da50a6effec0e752f3959e3d9e7367d6ce37d5036286e77a07' 
  AND token = 'n7LjSRpcSC05omEquZrhtB5XuREv9HU+PyN/X1Sg/tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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