SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171976db55775af57c4aa07db2c87d3bef4a581c3ec4f7ff7e3e8d194676f821' 
  AND token = 'pGQASphqLwr70Gde2+RcYkvvL/gsogU4Z1nCDZ1pzqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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