SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'af55b573b02c92202a8946cde8f19b60bc2f1d4dcd1795af4733535b248915dc' 
  AND token = 'babByLOwvl/AFnj+WtbcqOQcGA2FmTOo6VMGyHYVNG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00901

JSON explain

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