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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8dd8c0f66dedf6f6b29be480c42eab12b2074a4d4dc572bf117db861dcd409e' 
  AND token = 'wND1ZT8G0/+D9IAe0sJ+7gno/yPcXxPJ2hSFHpuwIqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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