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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '77481e579b4327b8579bb6befb06615ba9d95aff06ea9f6300829402b086c47f' 
  AND token = '02u/h725FrYsevjpq3d/bi8BtOpK6Gcv7vueLO/hs0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00770

JSON explain

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