SELECT 
  a.option_id, 
  a.product_id 
FROM 
  cscart_product_options AS a 
  INNER JOIN cscart_ult_objects_sharing ON (
    cscart_ult_objects_sharing.share_object_id = a.option_id 
    AND cscart_ult_objects_sharing.share_company_id = 1 
    AND cscart_ult_objects_sharing.share_object_type = 'product_options'
  ) 
WHERE 
  a.product_id IN (12580) 
  AND a.status = 'A'

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "a",
      "access_type": "ref",
      "possible_keys": ["PRIMARY", "c_status"],
      "key": "c_status",
      "key_length": "6",
      "used_key_parts": ["product_id", "status"],
      "ref": ["const", "const"],
      "rows": 1,
      "filtered": 100,
      "index_condition": "a.`status` = 'A'"
    },
    "table": {
      "table_name": "cscart_ult_objects_sharing",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "159",
      "used_key_parts": [
        "share_object_id",
        "share_company_id",
        "share_object_type"
      ],
      "ref": ["noframes_angrybeaver.a.option_id", "const", "const"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "cscart_ult_objects_sharing.share_object_id = a.option_id and cscart_ult_objects_sharing.share_object_type = 'product_options'",
      "using_index": true
    }
  }
}