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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a19638959ff8e2bbdf60bcd49a7a8f578e57307543735386ae5c705375de40' 
  AND token = 'U52Ed/tc0rbVw7Xe7gXL1eHtRzfpxiWEurJ0zRMY/vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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