Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f3d8cb5e6d155b9f25e99146ad2d38582ce9aa1f9f849d0a2855bff5ee43b9' 
  AND token = 'yd2UxA1FTwbvNZDjXqBAq71Wwqcm0qb1wuJ6Qg/kJmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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