Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141f9147aef14b6ceb372d7ac2808be7461535c220b4cd871a613c79fb0e66b8' 
  AND token = 'WFrQ6gFHyy3vPTOs18obH//43wZULQqFot99E6W93lY=' 
  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"
    }
  }
}