SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b02ebc4a4e2f24ec9af7edb245d989852389bb46ece17c944d724106135b392' 
  AND token = 'lmZ7OeL5GwlHr4XlK/9tqREbYCufOXxzgpnQZJ6btV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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