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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8ae30fc23403075b27e8c655a24fde98875880509f216a26f09b28cf02109552' 
  AND token = 'lNJ0BwlqrPXsn31VGz6+30xX4G1NnuT0zrBlXLw1O4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00766

JSON explain

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