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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb4293b9803490ab29591a28bf037da949c741c302baaa4add65328292c9f7d' 
  AND token = 'WZ4N5D7Ui38hbs8xvmTWco+MIvA8isJhNsH2z7anbaQ=' 
  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"
    }
  }
}