Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1963f854fe8caa0a86f7964e5d82a2beb5607550f63efae636a4e6a8ae363636' 
  AND token = 'oI54iMRB21plSA7TpeE+DGa0RTZA2RmUB0qtsmMn/vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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