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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '2d53b3f06f4436cc10e00a608ad28c99f6a4d400b4d2b8bfb2eede4d8df039a4' 
  AND token = 'k2iTTkiMUuXescBVWfXy65T0/YnkejFJc3TUqGc+cYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00748

JSON explain

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