SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5efed863b17b6e1b904e9daa5174079f570c54a78b37d0e8901279c7a949937d' 
  AND token = '1uT5NkvQFmLTvESIR+mh3s79aOmO9m4i1Ivx55bbVwQ=' 
  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