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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d47e95e90eda350b3f6633502395dad6d46d17a0de2ace8a7275159b62e092e' 
  AND token = '4QOkKqyFen0K0CqcXEdD04Do4Jhw4AAdzkQWwDeOWqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

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