Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b355495fa5598508f4088797f4a5255df1b7e01c1ef69f67d85e7617c0d5e2ae' 
  AND token = 'Tl+9Z+qx9Jo/gScM+6tAlmRroREzU1YDTcoJvYztfIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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