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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'fd29b755641979ab9b8aef5b4e00268f4c27766a4f30da3f399a132e99cee380' 
  AND token = 'eO1bkW1QcRACx5XAnX/0/9M93jXqz5ZBkJlg7it6QC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00769

JSON explain

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