Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf3abc941fabb0fba01904cba5b47522bd1ff1020fd37f40d473af52922fc5f' 
  AND token = 'LWGON8cyQBshbDLYLiM+XU5AMRhmNBFuecwJE59DoJM=' 
  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"
    }
  }
}