Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542d4deac80e22ddce89633c1330e53eb840e216dc1c6a10c8793cdca060f13d' 
  AND token = 'DMJCOyAO00gxvYcqfishMBoJOVYKjb5ePiHiVpq/rLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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