Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9330a91c095d83d2615b310226d55cb2862ad530cffccaeb7e630ab9a5c6095' 
  AND token = 'V8vxBZE720uR7YXcTZip835ubYOdVy5fccRh87JVRdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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