Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa033723d4edd21834cdfa2fb3f080a5c1ce6ba19987e619be0abf2c4f0561d2' 
  AND token = 'PZ0MLkE2QMhNftiphy4F5PFQEYU35c7kikAkZn6p8Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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