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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1e98bc31423deb2d07c34ee592a759ba20da185ee8e931e7e4661067c7a445' 
  AND token = 't84biBi88RR+n/yvZlaKhdbRima58BdMeeaT3g/cabo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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