Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5025736d98216c3e8f7974407e8b611192673625e013eb0ffec81f721c0939fd' 
  AND token = 'EjsHZVGSjcVKFO47H4i8M2W+eDFmu7iSfCnGOkzD0vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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