Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93c0e2a794e7a97d24e401b2b056e4d8060fea601a1bb6a34144c51e366e43c' 
  AND token = 'L3J9RmcRJ310ymZwMNsBKudWrwHA//dl8ZAcdXIkrxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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