SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ce59c36b55a3639d8524b86094dbf6f693ef99c85d3cfb4d5256ebba9e313a7' 
  AND token = 'J+3D+RKdnk+7WDD4/ZjqWbJPkVY0BKZ2NZCvB0USFbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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