Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fe644b058134d9d403581faeeb22336406d9afd6de9c3b56451e8dd181a55c' 
  AND token = '2luzEzOqomaK3cqpDe4CLey21PbxuKFaJwU8Eh33VGs=' 
  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"
    }
  }
}