SELECT 
  redirect_id, 
  src, 
  type, 
  object_id, 
  dest, 
  lang_code 
FROM 
  cscart_seo_redirects 
WHERE 
  src = '/blog/phuc-sinh-tp-oan-u-tien-nhn-chng-nhn-kim-ke-khi-nha-kinh-cho-toan-h-thng'

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_seo_redirects",
          "access_type": "ref",
          "possible_keys": ["src"],
          "key": "src",
          "key_length": "767",
          "used_key_parts": ["src"],
          "ref": ["const"],
          "rows": 1,
          "filtered": 100,
          "index_condition": "cscart_seo_redirects.src = '/blog/phuc-sinh-tp-oan-u-tien-nhn-chng-nhn-kim-ke-khi-nha-kinh-cho-toan-h-thng'"
        }
      }
    ]
  }
}