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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '234d0160a0ee9b0e34f934f1aee6514195a5e04bd7e622ca16e960cf785e1244' 
  AND token = 'DwU0pJMYldmoo3Uqr1yAyDpUaFowViuriIhBKWpw8GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01520

JSON explain

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