Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c66afef9a6c6ee281d1b7c304b3d9d2a55974c22ea00b81988c32aeb01d741' 
  AND token = 'ntApkg2PXD9tPjRPQpUZbDmzDn4e3lQ9Vb+s7GlfrZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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