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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '385256b383144c6affb8def1abf4fef0722ff6f939488c7136ac48d2dd3d2760' 
  AND token = 'QT/OJ+PWYRXkIWGH8GnJsCVAQfT5FRftIdJyZleczeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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