Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f2fe77c612330406facef82f643816091946cca992f85aeef22e5412718f880' 
  AND token = 'cQNbdtJTIANLJ7E7wNwDYdWQQXGQ8PfssChgonzHJ84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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