SELECT 
  redirect_id, 
  src, 
  type, 
  object_id, 
  dest, 
  lang_code 
FROM 
  tconnect_seo_redirects 
WHERE 
  src = '/electronics/cell-phones/apple-iphone/apple-iphone-4s-black.html'

Query time 0.00089

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.002024411,
    "nested_loop": [
      {
        "table": {
          "table_name": "tconnect_seo_redirects",
          "access_type": "ref",
          "possible_keys": ["src"],
          "key": "src",
          "key_length": "767",
          "used_key_parts": ["src"],
          "ref": ["const"],
          "loops": 1,
          "rows": 1,
          "cost": 0.002024411,
          "filtered": 100,
          "index_condition": "tconnect_seo_redirects.src = '/electronics/cell-phones/apple-iphone/apple-iphone-4s-black.html'"
        }
      }
    ]
  }
}