SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'b15047f0c1c9dd4f7d9a6f147f954c3a77142d53def3882808333a9a66b520a4' 
  AND token = 'yRvsPyw3uzQ9KUWfuYnUGkUO2eh10Omvn56eQtJrJ/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01179

JSON explain

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