Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b740b806d9ba327dd025affa9c6083c71c094a0a767db82d4852ef0f724bcf' 
  AND token = 'MNLsyxxSEOHBzQ82DzT3gRfJRtsSWiYXUc4m3SGLEOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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