SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f312ca284e32c41456e8d5da5f1fa7470764f129667b9408f696557629f28b' 
  AND token = 'NXIrQ5ULK0OkKu/+Lm6j9wJ/CweGRI5SRncfo8zcV8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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