SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b98fd44f6788ee120fbdd7d9d4fa218a92b05ec1eed43107a8576b372ce576' 
  AND token = '8mbl1Xc5QEC+xxPGz+4G6/qHvUKEFBGSHXkc6ZVSyDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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