SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e066d578ab3d376b9ea904d08f1162ff46b7e86c825de06fb83277c0256e89' 
  AND token = 'uVP1Xl3SGHuG3XF+QgQpQwsCm2r5GBUy8fcTeK/21jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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