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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '454fbafecb088e3eb322505106aeaae2571298b49acf73b775f9785436d638de' 
  AND token = '4Z0Rx5GyG2hvJ+3RV8EZGbtPhaNocIh1WqtvY9oqw34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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