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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '83836bf83a2bc7fa64af8c847c090a63f3839d6deb5e95ae266381be0e339eb0' 
  AND token = '4bFAAhFpgr/DsTOlAP1wTjGwqafc7VdlKVzFV9BoNoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00839

JSON explain

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