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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31dfb829e5e99ef6da4c5066afe3c0589d50cef17ea9d65016f2d516444a952' 
  AND token = 'lljGHOnOwHS46HrcpcC/SuMDsbJguc6QOd5hYz+kPGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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