SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26125b946ad2441dd35a03305f1894b224830864205dad340cb06c5c710a2823' 
  AND token = 'FM8p2/xdYX6xUFsvyy+7PwQVDCBKaZnkOXzmp4KF3JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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