Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d70a9db58351cda65412a18f1d0c972e69c8a8a0fe901edcf4208c6f7b4925' 
  AND token = 'HBZNPqTsVcRijXYif1YSSirHQK9ld6ZiJMA+xCBfRaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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