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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991de93f574d5305163a273de361ef905da2f2130685dbc37a4c7f40386eca64' 
  AND token = 'liaTsY0/t8vaKmMq5ikqSZccvTBVVo2tAdW53evl9Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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