SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '413a722f4d7f811067542650f5bc578113486e04e84cbbaf5249f0135edffb9b' 
  AND token = 'nkIdhDTs6/QHIUH5/En/WUIVxwHn+ZVOqLenTjRFKYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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