Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5423b857df91b92e171780b8ae73a4cd205740714da13de2d9ac390eef207ce8' 
  AND token = 'FFBhaEQC18GdCFm0yEZUsOzs8UA5N2StjtxS6H8+Szw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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