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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'b04d40be92495968bac7ddcbd1715974dc70e847b07ce02c5c896c6cef25422a' 
  AND token = '7g6IQNRilDUmcHeJEEx4mSP4YwFkUJ5Yqz36FaKvTcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00908

JSON explain

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