SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c953a7a7ae38f6b44b838b1dbcda5e1f858576364691aa1d6bb737ba244b2ec' 
  AND token = 'dOBhzd1Z3JwaTw0vrNv2pm0XKB/XZ5H3U5mjubRx2Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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