mysql> set @x = '{"Название":"ОАО \\\"Ноги\\\""}';
Query OK, 0 rows affected (0.00 sec)

mysql> select @x;
+--------------------------------------------+
| @x                                         |
+--------------------------------------------+
| {"Название":"ОАО \"Ноги\""}                |
+--------------------------------------------+
1 row in set (0.00 sec)

mysql> select CAST(@x AS JSON);
+---------------------------------------------+
| CAST(@x AS JSON)                            |
+---------------------------------------------+
| {"Название": "ОАО \"Ноги\""}                |
+---------------------------------------------+
1 row in set (0.02 sec)

mysql> select JSON_VALID(@x);
+----------------+
| JSON_VALID(@x) |
+----------------+
|              1 |
+----------------+
1 row in set (0.03 sec)

USE service

CREATE TABLE quoted_chars(spec_char CHAR(1), quoted_char CHAR(2));

INSERT INTO quoted_chars(spec_char, quoted_char)
SELECT '\\','\\\\'    UNION ALL
SELECT char(0),'\\0'  UNION ALL
SELECT char(8),'\\b'  UNION ALL
SELECT char(9),'\\t'  UNION ALL
SELECT char(10),'\\n' UNION ALL
SELECT char(13),'\\r' UNION ALL
SELECT char(26),'\\Z' UNION ALL
SELECT '\'','\\\''    UNION ALL
SELECT '\"','\\\"'    UNION ALL
SELECT '%','\\%'      UNION ALL
SELECT '_','\\_' ;