SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb738087d253e69b45dcaa94a125f0d2d7718a5b14ea96bdb03f33f8013e8b5f' 
  AND token = 'FIjrJhtMoq/NZSxC4DfiOaT2slgHzzMp6kSh7+HAsYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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