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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c100de2309c612dd83063db91b21ff4f49d45ef589c336b8b43825a6a1214b' 
  AND token = 'VJ0Na2R8eGJncpvwgCS1ZGOKArkLGttQa9Q8ZTE3ZJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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