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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '3544bea348880eba82ae64a833dccd978173d67c0cd8a1b49e60df087ec24b2e' 
  AND token = 'plA0R2MQ8IwYna8S6RqKpktZ7+jtkTM7Zl+G17fbQTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00804

JSON explain

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