Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83cfb1ec247209359b4dd9479582049be93bf568ad0decf6ac2008b23637ef95' 
  AND token = 'zh1RBW4uQvFbVtoaWQx4pHUeigNwxN62UnAF6BsKiCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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