SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f56bed31c3a9ee0ebef45455492f784406df8e0e2d5c7bc3cf93fa78876c9982' 
  AND token = 'Jk0XCYytwKGAOzmfgKxZB/xqPsScFaDcWUQDAHS7sBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00833

JSON explain

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