Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfba3cc2df51668be7cf26b355a53d01df4f074475ef2979c7dfd020e7d67107' 
  AND token = 'MJTVs1gnxfHR9fTLynEX89v5My6qZukpPp3aPKfQ2Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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