Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e103e17ae6b0350b16b6fd614e36f5fcc2c2a1bc71c8a098275a259f54931e40' 
  AND token = 'YSiMcxdMTaUhbM52UZvZL4MQzwngKoPhTSU7noz3sxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00795

JSON explain

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