Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d42e2808d18f23182066aaee10c0b375e116d0d6bebafc5f06fa76e7ae338bc' 
  AND token = 'IYbqqQbe5Qh0TGD/xAs0L4vX/5bzO2+H9bu4ZlG0U7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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