SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7e7a54b61b2bf4eada41db2863d492018a54ff1c9cbb6bcda5ad83d117abd0' 
  AND token = 'jDaC9JZZJBJieGV2uLFujTXFYKTtBxUYYAqOUyPYxPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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