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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d2e1eaf07974a90a4d104a1fe275508a378b7787f8b579741cedad9bfc6483a' 
  AND token = 'M1wqx8fL05aGiaBrcw7yigSfjYU5nyyRxADrlole7sc=' 
  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"
    }
  }
}