SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89453ab5238c42aec6387674d5a5dd80fd3d843b83a6e59b1cabd62bb119f797' 
  AND token = 'iax0rXFF/p+jhsJfXu01wZqR1+kd2iXh6lILiMKf50U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}