SELECT 
  category_to_id 
FROM 
  cscart_ble_category_redirects 
WHERE 
  category_from_url = 'products.quick_view?product_id=65889&prev_url=index.php%3Fdispatch%3Dcategories.view%26category_id%3D1921%26page%3D5&n_items=65889,65836,65891,65964'

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_ble_category_redirects",
      "access_type": "ALL",
      "rows": 81,
      "filtered": 100,
      "attached_condition": "cscart_ble_category_redirects.category_from_url = 'products.quick_view?product_id=65889&prev_url=index.php%3Fdispatch%3Dcategories.view%26category_id%3D1921%26page%3D5&n_items=65889,65836,65891,65964'"
    }
  }
}