SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0465847f5128ec5b4df819a07407bc3cc95c27c3de99a598f3e17614922cd0a2' 
  AND token = 'TJy2Dg+nbiIks3CdKKVpiCYvwthea+0h8tJNGJjoKU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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