Data Encryption static encrypt

My hexidigit is changing on day by day basis. How can I change it back to static

Code

from Crypto.Cipher import AES
import pandas as pd
import mysql.connector

myconn = mysql.connector.connect(host="######", user="##", password="######", database="#######")
query = """SELECT * from table """
df = pd.read_sql(query, myconn) #getting hexidigit back from the SQL server after dumping the ecrypted data into the database

def resize_length(string):
    #resizes the String to a size divisible by 16 (needed for this Cipher)
    return string.rjust((len(string) // 16 + 1) * 16)

def encrypt(url, cipher):
    # Converts the string to bytes and encodes them with your Cipher
    cipherstring = cipher.encrypt(resize_length(url).encode())
    cipherstring = "".join("{:02x}".format(c) for c in cipherstring)
    return cipherstring

def decrypt(text, cipher):
    # Converts the string to bytes and decodes them with your Cipher
    text = bytes.fromhex(text)
    original_url = cipher.decrypt(text).decode().lstrip()
    return original_url

# It is important to use 2 ciphers with the same information, else the system breaks
# Define the Cipher with your data (Encryption Key and IV)
cipher1 = AES.new('This is a key123', AES.MODE_CBC, 'This is an IV456')
cipher2 = AES.new('This is a key123', AES.MODE_CBC, 'This is an IV456')
message = df['values'][4]
eypt = encrypt(message, cipher1)
print(decrypt(eypt, cipher2))

I'm able to decrypt the string after calling from database but on the next day the encrypted string changes which fails my code. How can I freeze this? Keeping a constant string everyday?