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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'd9d6e2f962afcd7f86e5f4089fb14daf2899dbfbe51f30762f2f1038a97bed76' 
  AND token = 'EXfT97rhwCW9pzyBiVTQdEj6Oe08Lq1STtLqzDPMT9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00876

JSON explain

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