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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '15470da4c358813cf9abaacdced41cd8dbb08834256f123f8c38745cce9ccfde' 
  AND token = 'hnqoxQkzCjWzDv2gkwoAAJptynveyiwfOkfCH77qdV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01621

JSON explain

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