SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32d778a0080b8f151e6f35c02f2b46b52aa9718f62b0e00dcee7b8d74a132cc' 
  AND token = 'quUQtpwRXjFPvF6KQaNFv7sGe8UJFZUWmQvTpl2LMYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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