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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5523608c0a213c8fe7d6c2bfd70e1e12d379c3c72b708229bae09d8876e56a99' 
  AND token = '5c8cTZc0lKRwF7DxRyi14qj9fUztl1gmZ+dXB5tg+DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00751

JSON explain

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