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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '4bb44566189cb2e87f7b9da5fded8de1f35e7a94aa94e3af43cbbf0ad0c44644' 
  AND token = 'tKXdhIU+16B4cziQCPlJGaryq979kaL5a3sQ+AZ6Amg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01533

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}