SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2022ee132dc5b02ad1f682c60cc1132e40d60e0b50a819e4509f9a05f885b9' 
  AND token = 'XzFzU3ZFBbbQuGUku9PS9/VM5npIgVsLKsYzn+uJ3Ug=' 
  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"
    }
  }
}