Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919c2bdaa118bc5a7c3d0167d8ac8fae710324efbd554105dc34ee8be0b86db6' 
  AND token = 'S81Ku+300xiwPHSAv3hM51TOUWp0JsJdrVc7o8BsZWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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