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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '434d1ee79396be65ca64f7892be129698c330d275f9d4996eec693c6c6cfd53b' 
  AND token = 'vi1iOPMU+seIGDtbuUIdnd8xfjTPnD6tXCZ2eZyC7RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01562

JSON explain

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