SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '6ae9a7f41b03af5967086dfc6b7d7418e169323bdcb21da4fe4d7858f53bce34' 
  AND token = 'Owvy+oojPM2B0XTYwltw4bMuKcze8/sb70TCSP/vPPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00823

JSON explain

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