SELECT 
  redirect_id, 
  src, 
  type, 
  object_id, 
  dest, 
  lang_code 
FROM 
  cscart_seo_redirects 
WHERE 
  src = '/knapsack' 
  AND (
    cscart_seo_redirects.company_id = 2 
    OR cscart_seo_redirects.company_id = 0
  )

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_seo_redirects",
      "access_type": "range",
      "possible_keys": ["src"],
      "key": "src",
      "key_length": "771",
      "used_key_parts": ["src", "company_id"],
      "rows": 2,
      "filtered": 28.5714283,
      "index_condition": "cscart_seo_redirects.src = '/knapsack' and (cscart_seo_redirects.company_id = 2 or cscart_seo_redirects.company_id = 0)"
    }
  }
}