SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0ae86be71cfcd891a3c32bb87f3f125556d869f54f84c8bea63f8d9da7f6b1' 
  AND token = 'w932rUAysCs/QzUECw9kWlBTug2taCwDFKDvnLHjgPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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