SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350353b8edabb62f3017737c3c6ce54b6a5111258c758e06de25a91ab08913ab' 
  AND token = 'BMzT4SCXNYDU2VQZvIit2cyLXHhhfFPLXzkwmmBDQRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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