Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45951eac600495bdaaaa7dec02defad068e09800529e9c3f26797b55a67e2731' 
  AND token = 'XOqj64kDAgCim61p6252TQX5p+v7kkj1wQTpBtGYZu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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