Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea34505698f58a45abd014ef20a962e57397a56bd01665b759a6d7032777d55' 
  AND token = '7srmytUVUjtgUDwDZy1P+lWMh7PGTapgfDw7p4uuXVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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