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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d3cb8be95b880021678654074775e84d17066944291162ed0bc13e0f82aee0' 
  AND token = 'SsVpN6aLINHwOxzuRk41fj5APG6fatdtIcaGt7JmVcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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