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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '93e0afc1d5f046c4be9fcba29408b6ea9f0c1e64155ebab953c66e3fe6eee98c' 
  AND token = 'T7k9qGBgH9Lhj4+wuhHZaC6QHmIUl/uwUrkc6Qspv/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00816

JSON explain

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