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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '4f2ddd2bc0ee09cf6ed0ccbdf1eaa1fe9ba51c61ed912a4536881975a2a6bd71' 
  AND token = 'NP4Yl0PTF9vRMSvlj4eIiGhcnOid2OTurAYFnzgmhgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00891

JSON explain

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